Simpe question.. What is better performance wise if I have an object which needs backface to be rendered? Having a double sided material or copying the polygons and flipping them?
If you have high polygon count, then double sided may help. Otherwise it doesn't affect performance noticeably.
The problem with double sided polygons is usually that they need more code in vertex and fragment shader to be properly lit. I would advise not to use double sided materials unless you have to.
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